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Pennsylvanian period

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.04 sec.
Pennsylvanian period: see Carboniferous period Carboniferous period (kärbənĭf`ərəs)
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Around 315 million years ago, during the Pennsylvanian period of Earth's history, these regions formed the tropical belt of a huge supercontinent that straddled the equator.
This is just the opposite of what scientists had thought was the last major movement during the Pennsylvanian period some 300 million years ago, in which the Wichita Mountains to the south were uplifted, causing land north of the fault to sink.
 
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